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How can Bash execute a command in a different directory context?
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You can use the cd builtin, or the pushd and popd builtins for this purpose. For example:
# do something with /etc as the working directory
cd /etc
:
# do something with /tmp as the working directory
cd /tmp
:
You use the builtins just l...
Meaning of tilde in Linux bash (not home directory)
First off, I know that ~/ is the home directory. CDing to ~ or ~/ takes me to the home directory.
8 Answers
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How do I run a program with a different working directory from current, from Linux shell?
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Call the program like this:
(cd /c; /a/helloworld)
The parentheses cause a sub-shell to be spawned. This sub-shell then changes its working directory to /c, then executes helloworld from /a. After the program exits, the sub-shell terminates, returning ...
Draw a perfect circle from user's touch
...tRenderingHints(qualityHints);
g.setColor(Color.RED);
if (cD == 0) {
Point b = null;
for (Point e : points) {
if (null != b) {
g.drawLine(b.x, b.y, e.x, e.y);
}
b = e;
}
}...
嵌套块验证失败:未知的代码块类型: procedures_ifreturn,已拒绝添加 - AI...
...pinned=\"false\" h=\"80\" w=\"160\">计算一个非负整数的阶乘。\n输入:n (数字)\n返回:n! (数字)</comment>\n <statement name=\"STACK\">\n <block type=\"controls_if\">\n  ...
让Google Chrome崩溃?只需16个字节! - 创意 - 清泛网 - 专注C/C++及内核技术
...发现的 bug 数量也也所增加。
据 VentureBeat 报道,最近的一个 bug 是——Andris Atteka 发现,Chrome 竟然可以被简单的 16 个字符(URL)给折腾到崩溃。
如果你感到好奇,不妨试着在 Chrome 地址栏输入“http://a/%%30%30”。
更糟糕的是...
c++ Timer使用总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...窗体发送WM_TIMER消息。
nIDEvent 定时器标识符。在一个窗体内可以使用多个定时器,不同的定时器根据nIDEvent来区分。
uElapse 定时时间,单位是毫秒。
lpTimerFunc 定时器的回调函数。如果该值为NULL,定时时...
获取控件的值的几种方法总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
... DDX_Text(pDX, IDC_EDIT_TEST, m_editTest);
}
这样就绑定了控件和一个数据变量,当控件数据发生变化Updatedata(TRUE)后就会反映到变量上。其他类型变量也一样。
Updatedata(TRUE) :将控件的值赋值给成员变量;
Updatedata(FALSE) : 将成员变...
error C2804:binary \'operator +\' has too many parameters - C/C++ - 清泛网 - 专注C/C++及内核技术
...应该重载为普通非成员函数。这里重载为成员函数时多了一个this形参,故对于+操作符来说,出现参数过多的错误。
即书写为:
// header file
Sales_item operator+(const Sales_item& lhs, const Sales_item& rhs);
//implement file
//Overloaded Opera...
/usr/include/c++/4.9/bits/stl_iterator_base_types.h:165:53: error: ‘i...
...地方法,例如使用
::distance(age[0],age[1])
或者将distance放在一个命名空间中,例如:
namespace foo
{
double distance(int a, int b)
{
return fabs(a-b);
}
}
int main()
{
foo::distance(x,y); //now you're calling your own distance function.
}
或者不...
